Tachyon

Tachyon

Tachyon MCP is a Java and Kotlin server runtime for the Model Context Protocol (MCP) built on Netty that simplifies exposing tools, resources and agent skills; it handles transport, protocol details, task progress, and provides declarative annotated handlers for building MCP servers.

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Pricing not listed API 70/100
#549 in AI Agents (549 tools)
Just launched
Data reviewed Sep 25, 2026

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Quick Overview

Best for: AI Agents

What it does

AI Agents software for decision-makers comparing workflow fit and alternatives.

Best fit

AI Agents

Pricing snapshot

Pricing available from Free (Apache-2.0)

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Tachyon

Tachyon MCP is a server runtime for the Model Context Protocol (MCP) implemented for Java and Kotlin, built on Netty. It lets developers write handlers (annotated or programmatic) while Tachyon manages transport, protocol handling, lifecycle and runtime concerns. The project includes quickstarts and examples for both Java (Maven/Gradle) and a Kotlin DSL, is released on GitHub, and is licensed under Apache-2.0.

Tachyon MCP is a production Model Context Protocol server runtime for Java and Kotlin. Netty transport, virtual threads, stateless by default, MCP 2025-11-25 and 2026-07-28 conformance.

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Key Features

Model Context Protocol runtime

Provides a Java and Kotlin runtime for MCP, conformance-tested against MCP 2025-11-25 and 2026-07-28.

Netty-based transport & lifecycle

Netty owns sockets and connection lifecycle; Tachyon uses Netty for transport and lifecycle management.

Declarative annotated services and DSL

Support for annotated Java services and a Kotlin DSL to declare tools and handlers (examples show @McpTool and @McpParam usage and Kotlin DSL declarations).

Tools, prompts and completions

Built-in concepts for tools, resources, templates, prompts and completions to integrate agent capabilities and tooling.

Task support & progress notifications

TasksExtension provides task support (create_task + task://{id}), with server-side progress notifications and TaskSupport options (e.g., REQUIRED).

Skills extension

SkillsExtension can serve agent skills as skill:// resources from filesystem or classpath registries and supports optional negotiation.

Handlers on virtual threads or suspending Kotlin handlers

Run synchronous Java handlers on virtual threads or suspending Kotlin handlers; handlers do not run on the Netty event loop.

Observability

Documentation mentions observability and OpenTelemetry integration for monitoring.

Pricing

Free Tier Available

Free under the Apache-2.0 license (project releases available on GitHub).

Open-source

Free (Apache-2.0)
  • Source code and releases on GitHub
  • Documentation and quickstarts

Use Cases

Build MCP servers in Java or Kotlin

Create Model Context Protocol servers using Tachyon's builder API, annotations, or Kotlin DSL and deploy via Netty.

Expose tools and long-running tasks to agents

Register tools (get_forecast, generate_report examples) with task support and stream progress notifications back to clients.

Serve agent skills and static skill resources

Use the SkillsExtension to serve SKILL.md and related files from filesystem or classpath registries as skill:// resources.

Integrate prompts and completions into agent workflows

Use built-in primitives for prompts, completions, templates and elicitation to support agent interactions and tool invocation.

Integrations

Netty

Underlying transport and connection lifecycle management is implemented on Netty.

TasksExtension

Provides create_task and task://{id} support and progress notifications for long-running operations.

SkillsExtension (Filesystem and Classpath registries)

Serve agent skills from filesystem or classpath registries and publish under namespaces.

OpenTelemetry

Observability support mentions integration with OpenTelemetry.

Benefits

Simplifies building MCP-compliant servers by handling transport, protocol, lifecycle and common agent patterns.
Supports both Java and Kotlin idioms (annotated services and Kotlin DSL) for developer flexibility.
Built-in task, skills, and tool abstractions enable robust agent tooling with progress and subscription support.

Limitations

DNS-rebinding guard (Host/Origin) accepts localhost only by default and is not an authentication mechanism — TLS termination and authentication must be enforced at ingress.
Requires JDK 21+ (specified as JDKJava 21+).

Frequently Asked Questions

No verified FAQs are available.

Getting Started

  1. 1 Choose Java (Maven/Gradle) or Kotlin DSL quickstart (see documentation).
  2. 2 Follow the quickstart to declare tools or annotated services (examples use TachyonServer.builder() or Kotlin DSL).
  3. 3 Build and run the server (examples show server.start() on port 8080) and test tool endpoints.

Support

docs

Documentation and guides available on the Tachyon site (Read the docs / Docs sections).

github

Project releases and source code available on GitHub (Releases on GitHub).

discord

Community/real-time discussion via Discord (page lists GitHub and Discord links).

API

Available: Yes
Documentation:

Documentation and API usage examples are available on the Tachyon site (quickstarts and code samples like TachyonServer.builder()).

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